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Storage of perishable materials, especially food, has long been difficult and costly for humans.
In this regard, many methods such as ground products such as walnuts and potatoes, smoked fish, put in vinegar and various other methods have been used.
Freezing food has always been a human concern. With the passage of time and the advancement of technology, different processes and methods have been provided for food preservation. Many factors, including cold, heat, humidity, drought, and bacteria and fungi all play a role in food spoilage. Therefore, using the freezing technique is one of the easiest and most logical ways to store food for a certain period of time. In fact, freezing food has increased the quality and storage time of different products, and in this way, we will no longer have to bear the loss of food spoilage.
Contrary to popular belief, freezing does not kill food germs; Rather, by slowing down the action of microorganisms, it affects the quality of food and prevents it from spoiling. There are several ways to freeze; Food can be frozen slowly or quickly. In the slow method, food is placed in a low temperature space to freeze slowly, but in fast freezing, there are different methods for this operation, one of which is known as freezing tunnels.
With the advancement of science and technology and the creation of industrial cold stores, humans were able to increase the storage time of food and products that need storage.
Below zero refrigerators are used for a variety of products that need to be stored in freezing conditions. Protein and perishable products and even some fruits. The temperature of such refrigerators sometimes reaches 32 degrees below zero.
These refrigerators are typically used in various capacities between 1.5 and 70 hp. The price of sub-zero refrigeration varies according to the required dimensions and horsepower and the required temperature.
The refrigeration system of smaller sub-zero refrigerators is typical of Freon, and for larger refrigerators, ammonia is used for this purpose. Numerous applications of sub-zero refrigerators from department stores to poultry and cattle ranches.
Products that need to be stored in conditions such as ice cream, butter, ready-made burgers, pizza cheese, etc. are such. Protein ingredients, including red meat, poultry and fish, are other products that need to be refrigerated below zero. Some fruits, such as dates, are stored in such cold stores. In general, many perishable materials can be stored in sub-zero refrigerators.
In terms of dimensions, sub-zero refrigerators can be divided as follows:
Large industrial refrigerator
Movable sub-zero refrigerators
Sub-zero condensers, also called Walk-In Coolers.
Refrigeration Warehouse
Room refrigeration is usually used to build small and medium-sized refrigerators and to store food in restaurants, distribution centers, hotels or fruit storage in gardens. In this way, a room inside the building is first insulated with the help of sandwich panels and then cooling equipment is installed inside it.
If there is a need for a small and medium refrigerator, but the space to be installed is in a shed or outdoors, a portable refrigerator or canopy refrigerator is used, which instead of using the walls of the room, a container and Or metal structures are used.
Large industrial refrigerators, which are commonly used to store food in bulk, typically consist of very large rooms, each of which receives cold water according to its needs, and food can be stored separately in each room. The city’s perishable public warehouses, where large gardeners or major meat and poultry distributors store their produce, usually fall into this category. These warehouses use a freon or ammonia system, depending on the situation.
Atmospheric control refrigeration is made for long-term storage of some materials that require special conditions in terms of air composition inside the room. These conditions include a decrease in the concentration of oxygen or ethylene. In this case, the room is completely ventilated and the air conditioning of the refrigerator is controlled in two ways.
Due to this process, the spoilage of some foods is delayed and conditions are provided for their long-term storage.
In the refrigerator with normal air, only the temperature and humidity of the air are controlled. The construction of food refrigerators is mainly done in this way.
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